It is important on diagrams to represent a force with an arrow because force is a vector quantity but it is not important to represent a mass since it is scalar quantity.
Vector quantities are always represented with arrows because they have magnitude and direction.
Scalar quantities have only magnitude, and cannot be represented with arrows.
Thus, it is important on diagrams to represent a force with an arrow because force is a vector quantity but it is not important to represent a mass since it is scalar quantity.
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